Oracle 11g ASM is supported as of Mirror Replication Agent 15.1 ESD #1. ASM provides file system and volume management support for an Oracle database environment. It can be used in both RAC and non-RAC environments. ASM allows definition of a single disk group from a collection of individual disk devices and attempts to balance loads across all of the devices defined to the disk group.
For more information, go to Oracle ASM information
For more ASM information, see the Mirror Activator Administration Guide and the Mirror Replication Agent Primary Database Guide.